Automatic turret-lathe.



J. C. POTTER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED mum 1913.

Patented Sept. 5, 1916.

6 SHEETS-SHEET I.

glvwofi M BY..

ATTORNEY J. C. POTTER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED MAYI5. 1913.

Patented Sept; 5,1916.

W/T/VESSES: 8 @2 J. C. POTTER.

-AUTOMATIC TURRET LATHE.

APPLICATION FILED mums. 19:3.

1 197,54 1 Patented Sept. 5, 1916.

e sums-swan 3.

' ATTORNEY J. c. POTTER.

AUTOMATIC TURHET LATHE. APPLICATION FILED MAYIS. 1913.

'6 SHEETS-SHEET 4.

W/T/VESSES: 45

J. C. POTTER.-

AUTOMATIC TURRET LATHE.

' APPLICATION FILED MAY 15, I913. 1,197,541, PatentedSept. 5,1916.

6 SHEETS-SHEET 5.

III J IN EN [1 Q IV B L ATTORNEY .A s fin) IPIELHIU {:11 2/245";

WITNESSES:

J. C. POTTER.

AUTOMATIC TURRET LATHE.

APPLICATION FILED MAY 15. 1913.

Patented Sept. 5, 1916. 6 SHEETSSHEET 6 l/Vl/E/VTO ,fr0mvy 1111 11 vrlllllL 1.

WITNESSES? a E fly M UNITED: STATES- PATENT OFFICE.

I JAMES C. POTTER, OF PAWT'UCKET,/BHODE ISLAND.

AUTOMATIC TURRET-LATHE.

' To all whom it may concern Be it known that I, JAMES C. Power, of

, on centers can be turned, 'but besides this for example, from one inch to fifteen inchesgeneral purpose, I have in view the production of mechanism by which the lathe will turn work of wide range of diameter, as

and whose adjustment will be very simple, both in respect of the adjusting .operation and the parts required foradjustment.

' In the drawings,Figure 1 is .a top plan view of an automaticturret lathe embodying my invention; Fig. 2 is a side elevation of the upper portion of the same, parts of the head and tail stock being shown in section; Fig. 3 is a detail view partly in elevation and partly insection, of the main turret operating mechism; Fig. 4 is a cross section on the line 4- 1 of Fig. 3; Fig.5 is a detail end view of the main turret tool operating devices; Fig. 5 is a detail view in perspective of the lever and trip device of the turret revolving mechanism; Fig. 6 is a detail top plan view of the tool-carrying portion of the main turret; Fig. 7 is an end elevation thereof; Fig. 8 is a view partly in section and partly in elevation of the crossslide and, the turret carried thereby and the operating mechanism for these parts; Fig. 9 is a section on the line 99 of Fig.

-8.; Fig. 10 is a detail, top plan view of the cross slide turret, and its operating mechanism; Fig 11 a detail view of the cross slide turret revolving pawl; Fig'., 12 a detail view of the pawl for releasing the locking bolt of the cross slide turret.

In the embodiment of my invention illustrated in the drawings, a base or frame 10 is employed, upon which at one end is mounted a head stock 11, having a spindle 12 with a center 13, and at the other end is mounted an adjustable tail stock 14 having a revolving center 15. A pieceof work W is shown as placed upon the centers, a a dogw connecting it with the spindle 12 so that the work will revolve with the latter,

throughout the various adjustments.

'll he spindle 12 may be revolved by any de- Sl red means.

i r Patented Sept. 5, 1916.

Application filed May 15, 1913. Serial No. 767,918.

turrets, one for carrying the series of tools for the turning operations which involve movement longitudinally of the work, and which, for distinction I shall term the main turret, and the other carrying the series of tools for operations that involve movement transversely of the work, and which being carried by a' slide whose movements are crosswise of the machine, I shall, for convenient distinction, term the cross slideturret.

I shall first describe the main turret and its operating mechanism. Said main turret 16,

instead of being mounted so that its axis travels in a line with the axis of the spindle, is situated at one side of the spindle axis, or is offset, so that it travels, or reciprocates alongside of' the work W. Said turret 16, is mounted on a horizontal shaft 17 journaled in a standard 18 supported on the main slide or carriage 19, so as to be slidable transversely of the latter and thereby efiect the adjustment of thecutting tools according to the diameter ofthe work to be turned, said adjustment being effected as hereinafter explained.

For revolving the turret step by step, to bring the cutting tools successively into working position, the turret shaft 17 has, at its inner end a ratehet wheel 20, on the hub of which is journaled an oscillatory gear wheel 21 carrying a feed dog or pawl 21 which engages the teeth of the ratchet wheel, and turns the latter through a partial rotation when the gear wheel 21 makes a partial turn in the direction for feed. The

gear 21 is in mesh with a pinion 22 on a horizontal shaft 23 journaled in the standard 18, and alongside the pinion 22 is a pinion 24 which is engaged by rack teeth 25 on a vertical bar 26, which also has rack teeth 27 in mesh with a pinion 28 journaled in hearings in the slide or carriage 19, and

extending transversely thereof. Said pinion 28 is elongated sothat, as the turret carrying standard is shifted toadjust the tools to the diameter of the work, the rack bar 26 will remain in meshl with the pinion rack bar 26 is pressed yieldi'ngly down- The ward, by a coiled spring 29, to return the pawl carrier gear 21 after a feeding movement, and to lift said rack bar for a feeding movement, there is attached to the shaft 20 of the pinion 28, a downwardly extending crank arm or lever 31, whose lower free end is in positionto engage a lug 32 on the side of an arm 33 pivoted to a block 34 on the side 'of the machine frame 10, such engagement of the lever end and the arm lug 32 taking place when the turret slide moves rearward. As the lever 31 moves upward when it swings forward from its contact with the arm lug 32, the lever end passes over said lug as the turret slide moves rear ward and the lug 32 is carried by the pivoted arm 33 so that when the turret slide again moves forward and the lever end encounters the lug 32 the lug-carrying arm 33 will rock upward and permit the continued forward movement of the lever 31 with the turret slide, the lug-carrying arm 33 dropping back into its position to again actuate the lever 31 when the turret slide again mloves rearward. The arm 333 when in position to have its lug 32 rock the lever 31, has its lower edge in contact with a shoulder on the block 34 as is clearly shown in Figs. 4 and 5, and it rocks upward from said stop shoulder when in the forward movement of the turret slide, the lever 31 engages the lug 32 and by-a camming action on the lug 32 lifts the arm 33 which drops to said stop shoulder after the lever end passes out of contact with the lug 32. The'lug-engaging end of the lever, is laterally oflset, (see Figs. 4, 5 and 5) to enable it to coact with the lug 32, as'described.

The main turret 16 has in its periphery near its rearend a series of equidistant looking notches 160 one for each tool adapted to be'engaged by a locking bolt 35 mounted for vertical movement in a guide in the standard 18 above the turret, and yieldingly held into engagement with a notch 34 by a coiled spring 36. The bolt 35 has rack teeth 37 on one side which are in mesh with a pinion 38 and meshing with a pinion 380 on the same shaft with the pinion 38 is a vertically movable rack bar39 which is also 1n mesh with a pinion 40 elongated like the pinion 28, and to the shaft 41 of which pinion 40 is attached a lever 42 similar to the lever 31, and adapted, by the rearward travel of the turret slide, to engage a horizontal lug 43 on-an arm 44 pivoted to the block 34, and thereby be rocked and through the pinion and rack bar connection described, the=locking bolt 35 will be lifted and the turret released, ready to be revolved by the mechanism already described. On theforwardmovement of the turret slide the lever 42 engaging the Mg 43 on the arm 44, tr1pspast the latter, by the upward swingmgfof the arm 44, which carries said lug 43. The construction and action of the lever 42 and the arm 44 are similar to those of the lever 31 and its coiiperating arm 33, and in the case of the lever 44 a spring 440 yieldingly and normally holds it against a stop 441 on the supporting block 34.

The main turret is shown as provided with four cutting tools 45 which may be of the simplest possible typea Each is carried by its own slide 46 mounted upon a block 47 that is attached to the end face of the turret, and for each slide 46 there is an adjusting screw 48 by means of which the cutting tool may be shifted towardand from the work W. Such shifting may be done automatically, and for the purpose of turning irregular forms,- in which case, the adjusting screw 48 may, as shown, have attached to it a spiral gear 49 that meshes with a spiral gear 50 on a shaft 51 concen trio with and extending through the turret shaft 17, and which shaft 51 has a pin.- ion' 52 in mesh with a vertical rack bar 53,

' that is mounted in guides on the standard 18, and is yieldingly pressed downward by coil springs 54. The rack bar 53 also meshes with a horizontal elongated pinion 55 journaled in bearings ,on the turret slide, the pinion being elongated to maintain the engagement of the rack bar therewith throughout the range of adjustment of the turret toward and from the work W to suit the various diameters tobe turned. Also meshing with the pinion 55 is a rack 56 on the upper part of a vertical plunger 57 mounted in a guiding In 58 on the turret slide"l9, the lower end c which plunger is in position to coact with the upper side of a guide or former 59 which has a contour corresponding to that of the form or shape of the work to beturned. The guide or former 59 is conveniently bolted to the block 34. It will be seen that as the turret slide reciprocates, the plunger 57 will follow the contour of the upper side of the former 59, and through the gearing between the plunger and the tool slides 46, the cutting tools will be made automatically to traverse the work according to the contour of said former.

It will be understood, of course, that the automatic movement of the cuttingtools, I

have just described is independent of the turret locking bolt and the turret revolving mechanism are controlled, it will be seen that adjustment of the turret to suit different diameters of work, involves nothing more than the turning of the adjusting screw, for whatever the adjustment is, the members of the locking and revolving mechanism are always in operative relation without any adjustment thereof being required.

.The turret slide 19 is reciprocated, as is usual, from a cam drum 63, such for example, as that of my United States Patent No. 1,040,751, issued October 8, 1912, to which reference may be made for a disclosure of the a same and the means for revolving it, it being sufficient herein to say that said drum 63 has a peripheral groove 64 into which pro jiacgs a roller stud 65 on the underside of the s 1 e.

The cross slide turret 66 is of the flat type and carries upon its-upper side a circular series of cutting tools 67. It is mounted upon a slide 68 that is reciprocable trans versely of a carriage 69 that is adjustable longitudinally of the lathe bed to suit the/ length of the work, or the positions where the cross-slide turret tools are to work. Said 74 mounted on the carriage 69, such coaction being produced by the reciprocation of'the turret slide 68. When the pawl 72-is engaged by the stud 71 to release the locking bolt 70 the pawl 72 has a bearing against the side of the carriage 69 which results in the camming outward of the locking bolt as its a stud 71 passes ov er theinclined outer end of the pawl 725 On the reverse movement of the cross'slide turret 68, the stud 71 engaging an inclined surfacg, 720 on the pawl 72 will swing the pawl 72 against the pressure of a holding spring 721 and the stud 71 will trip past the pawl72. In the interval of disengagement of the locking bolt 70 from the turret 66-, the latter will be rotated one step by the action of the feed pawl 74. The feed pawl 74is yieldingly heldin studrengaging positionby a spring pressed plunger 740 which permits the tripping of the pawl 74 out of the path of a stud 73 after a feeding operation, when the slide 68 again moves forward to the work, said stud 73 engaging an inclined surface7 11 on the pawl at such time to produce such tripping.

The reciprocation of the turret slide is effected by acam drum 75 that acts on a horizontal bar 76 having rack teeth which mesh with a pinion 77 on 'a' shaft 78, and

splingd to the shaft 78 so as to be sl dable the turret slide 68, and by its revolution causes the travel of said slide 68. The pin- I I a .ion 81 is carried by a shaft 83 which is lonv T gitudinally movable so that the pinion 81 may be disconnected from the rack 82 when it is desired to shift the turret carrying cross slide to adjust its tools to work of different diameters. which forms a handle for shifting it longi- Said shaft has a hand-wheel 84 tudinally, and to secure theshaft from accidental movement when shifted to co n t or i disconnect pinion and rack 82 it has two annular grooves 85 adapted for engag m t; 1

It will be understood th t th drum a latch 86.

63 for the main turret slide and the cam' drum for the turret-carrying cross-slidaare geared to and receive mot on from a com mon driving shaft, as in the cut above mentioned.

Whilel .have set forth 'certain details f case of r'n'y pat construction as characterizing themachine jv shown In the drawings, t 18 to be under-, J

Stood that m7v t l fis not restfictedlto such details of construction, gbut WidevaI- friations in construction of machmesmay be made, which. will involve n'o departure '7 from the spirit of my invention as set forth in the claims.

' 1. Ina turret lathe the combination' lof ing centers, a slide reciprocable in, the direc,

V Having thus described my inventiong lw hat I claim ishead stock and tailstock. having work-hold- I tion offthe axis of the work on the centersf.

a tool-carrying turret 'on said slide, the tools being mounted for movement thereon, means for automatically revolving the turret to bring its respective tools in position for work, comprising coacting members, one of which is connected with and fixed toithe turret, and-the other is relatively stationary, g and which members remain in operative.- onnection at-all. times, and ineans to'rshift the turret transversely of thedirection-of travel of the slide.

2. In, a turret lathe' 'the coinhin ation York head stock and tail stock having work-holda, 120; tionof the'axis of the work on the centers, 4

ing centers, a slide reciprocable in the direca turret on'said slide supporting movable tool holders, whose direction of movement'- "is transversely of the directionof .traveh 2 of said slide, means to. shift the turret transversely of the direction of travel of. the slide, and means for reciprocating said tool holders comprising coacting members,

one of which-is connected with and fixed to the turret, and $11? other is relatively ,sta-

tionary and which remain in operative connection at all times.

3; In a turret lathe, the combination of a turret, its reciprocating slide, a guide or former, relative to which sald sllde moves.

and means controlled by said guide or former acting to move turret tool, the too itself being moved with reference to the turret.

4. In a turret lathe, the combination of head stock and tail stock having workholding centers, a slide reciprocable in the direction of the axis of the work on the centers, a turret mounted on a horizontal axis on said slide and having a vertical tool-carrying face, a guide or former relative to which said slide moves, and means controlled by said guide or former acting to'move turret tool, the tool itself being moved with reference to the turret.

5. he turret lathe, the combination of a turret, its reciprocating slide, a guide or former relative to which said slide moves,

a plurality of tool holders movably mounted on the turret, and means controlled by said guide'or former to move each of said tool holders. v

6. In a turret lathe, the combination of I a turret, its reciprocating slide, a guide or former relative to which said slide moves,

a plurality of tool holders movably mounted on the turret, a shaft concentric with the turret, an operative connection between said shaft and each of said tool holders whereby the latter may be moved, and

means for rotating said shaft by said guide or former.

7. In a turret lathe, the combination of head stock and tail stock having workholding centers, a slide reciprocable in the direction of the axis of the work on the centers, a turret, automatic turret-rotating centers, a turret, automatic turret-rotating mechanism, automatic turret locking mechanism, and a support for the turret, the turret-rotating mechanism and the turret-locking mechanism mounted-on said slide, and

shiftable transversely of the direction-of travel of the slide, said automatic turretrotating and turret-locking mechanism remaining in operative condition at all points of transverse movement of the slide.

In testimony that I claim, the foregoing I have hereunto set my hand. I

JAMES C. POTTER' Witnesses:

EARLES Rosnn'rs, EDWARD J. FEELEY. 

